Abby Davidson, 4, of West Bend, Wis. covers her eyes from the light as she has her teeth inspected at the Riverfront Dentist in Barton on Friday, Feb. 1, 2013. Members of the Riverfront Dentist donated equipment and time to help give 12 children from the Head Start Program free dental work apart of the program Give Kids a Smile.

Photo: John Ehlke, Associated Press

Abby Davidson, 4, of West Bend, Wis. covers her eyes from the light...

Abby Davidson, 4, of West Bend, Wis. covers her eyes from the light... Photo-4125728.56147 - SFGate

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U.S. Secretary of State Hillary Clinton (R) shakes hands with Deputy Secretary of State for Management and Resources Tomas Nides after delivering her farewell address to the staff in the C Street lobby of the State Department on February 1, 2013 in Washington, DC. With a strong record in exerting what she called "soft power," Clinton is leaving the State Department and the Obama Administration after travling 956,733 miles and visiting some 112 countries.

People stand near closed ticket windows in Grand Central Terminal during centennial celebrations on the day the famed Manhattan transit hub turns 100 years old on February 1, 2013 in New York City. The terminal opened in 1913 and is the world's largest terminal covering 49 acres with 33 miles of track. Each day 700,000 people pass through the terminal where Metro-Noth Railroad operates 700 trains per day.

A woman rides her bicycle during a cold day in Chicago, Friday, Feb.1, 2013. A February hasn't opened this cold here in the 17 years since 1996. The combination of bitterly cold temperatures, hovering at daybreak Friday near or below zero in many corners of the metro area, plus the biting west winds gusting as high as 30 mph, are producing 15 to 25-below zero wind chills, readings as challenging as any Chicagoans have encountered this season.

Photo: Nam Y. Huh, Associated Press

A woman rides her bicycle during a cold day in Chicago, Friday,...

A woman rides her bicycle during a cold day in Chicago, Friday,... Photo-4125730.56147 - SFGate

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Astronauts from Houston fly T-38 training jets over the Space Mirror during a ceremony Friday, February 1, 2013 at Kennedy Space Center in Florida to honor the crew of space shuttle Columbia, STS-107 in remembrance of the 10th anniversary of Columbia disaster.

Esther Millar, 54, is overcome with emotion as she talks about her abuser, while holding pictures of Vicki and Mary, who she says were victims of sexual abuse by priest in the Catholic Archdiocese of Los Angeles, during a news conference urging those with information about alleged abuse to come forward on February 1, 2013 at Cathedral of Our Lady of the Angels in Los Angeles, California. Retired Cardinal Roger Mahony of Catholic Archdiocese of Los Angeles, who avoided criminal charges over the way he handled pedophile priests during his career, was reportedly stripped of his archdiocese duties February 1, by his successor Archbishop Jose Gomez.

Photo: Kevork Djansezian, Getty Images

Esther Millar, 54, is overcome with emotion as she talks about her...

Esther Millar, 54, is overcome with emotion as she talks about her... Photo-4125732.56147 - SFGate